If you describe someone as an ingrate, you are criticizing them because they do not express thanks to someone who has helped them—they are ungrateful.
If people try to ingratiate themselves with you, they try to get your approval by doing or saying things that they think will please you.
If something is gratuitous, it is freely given; nevertheless, it is usually unnecessary and can be harmful or upsetting.
When you have a feeling of gratification, you experience satisfaction or pleasure about a job well done.
When you congratulate someone, you praise them or are happy about some success they've had.
an expression of approval and commendation
expressive of sympathetic pleasure or joy on account of someone's success or good fortune
feeling or showing gratitude
make happy or satisfied
a feeling of thankfulness and appreciation
the condition of giving something freely, that can be harmful or upsetting
a relatively small amount of money given for services rendered (as by a waiter)
capable of winning favor
a lack of gratitude
Differentiated vocabulary for your students is just a click away.